While The Perfect Murder for Dummies is wholeheartedly in support of killing people, we must clarify that we mean adults who have already sucked up enough oxygen to have burdened the earth and society with their presence.
KILLING CHILDREN IS BAD.
For one, there is no sport in it. How hard can it be to shoot a 6 year old who is confined to a classroom. Show some initiative--go into a police or army barracks where at least the people there are equally armed an it could be considered a fair fight. Or if you intended to kill yourself at the end of the slaughter, why don't you just skip to the suicide part and spare the poor kids.
REPEAT: KILLING CHILDREN IS BAD.
If you hated your friends when you were at school, then save your anger for the alumni picnic or a reunion or something. (see previous post on this topic).
OH YEAH, IN CASE YOU ARE DUMB AS A BRICK: KILLING CHILDREN IS BAD.
If you want to kill someone, look at some of the previous posts for better targets, like child molesters or rich people.